that this may be a sign among you when your children ask in time to come, saying, "What do these stones mean to you?'
Joshua 4:6
Surrounding context
4:5 and Joshua said to them: "Cross over before the ark of the LORD your God into the midst of the Jordan, and each one of you take up a stone on his shoulder, according to the number of the tribes of the children of Israel,
4:6 that this may be a sign among you when your children ask in time to come, saying, "What do these stones mean to you?'
4:7 Then you shall answer them that the waters of the Jordan were cut off before the ark of the covenant of the LORD; when it crossed over the Jordan, the waters of the Jordan were cut off. And these stones shall be for a memorial to the children of Israel forever."